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Polarised-boson pairs at the LHC with NLOPS accuracy
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We present a calculation of inclusive diboson (WZ, ZZ, WW) processes at the LHC in the presence of intermediate polarised weak bosons decaying leptonically, matching next-to-leading-order accuracy in QCD with parton-shower effects. Starting from recent developments in polarised-boson simulation based on the helicity selection at the amplitude level, we have carried out the implementation in the POWHEG-BOX-RES framework, and validated it against independent fixed-order calculations. A phenomenological analysis in realistic LHC setups, as well as a comparison with recent ATLAS measurements, are presented.
Forward citations
Cited by 4 Pith papers
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Precise Standard-Model predictions for polarised Z-boson pair production and decay at the LHC
The authors deliver the first NNLO QCD plus NLO EW combination of predictions for polarised ZZ pairs at the LHC and validate them across five Monte Carlo codes and against ATLAS simulations.
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Evidence for longitudinally polarised $Z$ bosons in electroweak $W^{\pm}Z$ production in association with two jets from $pp$ collisions at $\sqrt{s} = $ 13 TeV and 13.6 TeV with the ATLAS detector
First measurement of the fraction of longitudinally polarised Z bosons in electroweak WZ+two-jet production: f_X0 = 0.32 ± 0.09, a 4.0σ signal consistent with the Standard Model.
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$CP$ violation in the $HZZ$ vertex and left-right asymmetries
Flavor-changing Z and Higgs couplings can induce CP-violating HZZ form factors up to about 10^-7, and a new asymmetry in Z* -> Z H is proposed to search for them.
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Effects of bottom quark induced processes on polarized $W^+W^-$ production at the LHC at NLO
Bottom-quark induced processes at NLO QCD+EW increase the doubly-longitudinal W+W- polarization fraction by about 7.6% with a jet veto and 10.5% without, after on-shell top-quark subtraction.
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